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Note 2 - Property and Equipment (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Abstract]      
Depreciation, Depletion and Amortization, Nonproduction $ 2.0us-gaap_DepreciationAndAmortization $ 1.4us-gaap_DepreciationAndAmortization $ 0.5us-gaap_DepreciationAndAmortization